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Author Topic:   4V heads with small valves
Mpcoluv
Gearhead

Posts: 928
From: Charlotte NC usa
Registered: Apr 2001

posted 10-20-2001 09:22 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
I was recently given a open chamber D3xxx 4V cleveland head. I thought I would now have a complete set of open chamber heads to sell.
I checked the valve sizes for the free on and it had 2V valves in it. 2.04"/1.65"
My question is, do these heads have any better velocity than the standard 4V heads?
I have heard superstock guys run these heads for better low end torque.
Anyone have any info?

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Moneymaker
Administrator

Posts: 19686
From: Lyons, IL, USA
Registered: May 99

posted 10-21-2001 12:35 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Smaller valves with the right cam will make a lot more low end on a 351C.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
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Mpcoluv
Gearhead

Posts: 928
From: Charlotte NC usa
Registered: Apr 2001

posted 10-21-2001 08:31 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Smaller valves with the right cam will make a lot more low end on a 351C.


Will the open chambers desire to spar knock reduce power elsewhere?
Ideally, well a fantasy lets say...you could weld up the open chambers and grind them into any shape you wanted I guess. I have heard of guys using some sort of insert into the bowl area of standard 4V heads and running smaller valves. Is this possible?

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Moneymaker
Administrator

Posts: 19686
From: Lyons, IL, USA
Registered: May 99

posted 10-21-2001 10:20 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Sure it's possible, but VERY cost prohibitive.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Clevo377
Gearhead

Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 10-22-2001 12:32 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
I thought all 4V cleveland heads came with the large (2.19) valves??

Paul

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Mpcoluv
Gearhead

Posts: 928
From: Charlotte NC usa
Registered: Apr 2001

posted 10-22-2001 07:14 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Clevo377:
I thought all 4V cleveland heads came with the large (2.19) valves??

Paul


Apparently a few of the 1973 heads had the 2V valve sizes. These heads carry the same casting numbers as the 1973 big valve heads. I guess they just ran them through the 2V tooling at the factory.

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